C#在WinForm下用摄像头

using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using webcam;
using PickHead;

namespace test_avicap
{
public partial class Form1 : Form
{
// WebCamera wc;
Pick pick;
public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{
//b_play.Enabled = false;
//b_stop.Enabled = true;
//panelPreview.Size = new Size(330, 330);
//wc = new WebCamera(panelPreview.Handle, panelPreview.Width, panelPreview.Height);
//wc.StartWebCam();
int left=0;
int top=0;
int width=352;
int height=288;
pick = new Pick( panelPreview.Handle, left,top, width, height );
pick.Start();

}

private void b_play_Click(object sender, EventArgs e)
{
//b_play.Enabled = false;
//b_stop.Enabled = true;
//panelPreview.Size = new Size(330, 330);
//wc = new WebCamera(panelPreview.Handle, panelPreview.Width, panelPreview.Height);
//wc.StartWebCam();
int left = 0;
int top = 0;
int width =352;
int height = 288;
pick = new Pick(panelPreview.Handle, left, top, width, height);
pick.Start();
}

private void b_stop_Click(object sender, EventArgs e)
{

//wc.CloseWebcam();
pick.Stop();
}

protected override void OnClosing(CancelEventArgs e)
{
if (MessageBox.Show("退出本系统?", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Question) == DialogResult.OK)
Application.Exit();
else
e.Cancel = true;
}

private void b_pic_Click(object sender, EventArgs e)//拍摄
{
if (this.b_pic.Text == "拍摄&A") //用于摄像的
{
b_pic.Text = "重照&C";
string path;
sdf1.Filter = "图片*.bmp;*.jpg;.jpeg;*.gif|*.bmp|所有文件(*.*)|*.*";
if (sdf1.ShowDialog() == DialogResult.OK)
{
path = sdf1.FileName;
pick.GrabImage(path);
pic_show.ImageLocation = path; //并显示在方框中
pic_show.Location = new Point(110, 12);
pic_show.Visible = true;
panelPreview.Visible = false;
pick.Stop();
}
}
else
{
b_pic.Text = "拍摄&A";
pic_show.Visible = false;
panelPreview.Location = new Point(110, 12);
panelPreview.Visible = true;
pick.Start();
}
}
}
}

调用的类(class1.cs)

//本文是借助avicap32.dll库来驱动摄像头。做到了抓图、录像功能。
using System;
using System.Runtime.InteropServices;
using System.Drawing;
using System.Drawing.Imaging;

namespace PickHead
{
///
/// 一个控制摄像头的类
///
public class Pick
{
private const int WM_USER = 0x400;
private const int WS_CHILD = 0x40000000;
private const int WS_VISIBLE = 0x10000000;
private const int WM_CAP_START = WM_USER;
private const int WM_CAP_STOP = WM_CAP_START + 68;
private const int WM_CAP_DRIVER_CONNECT = WM_CAP_START + 10;
private const int WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + 11;
private const int WM_CAP_SAVEDIB = WM_CAP_START + 25;
private const int WM_CAP_GRAB_FRAME = WM_CAP_START + 60;
private const int WM_CAP_SEQUENCE = WM_CAP_START + 62;
private const int WM_CAP_FILE_SET_CAPTURE_FILEA = WM_CAP_START + 20;
private const int WM_CAP_SEQUENCE_NOFILE =WM_CAP_START+ 63;
private const int WM_CAP_SET_OVERLAY =WM_CAP_START+ 51;
private const int WM_CAP_SET_PREVIEW =WM_CAP_START+ 50;
private const int WM_CAP_SET_CALLBACK_VIDEOSTREAM = WM_CAP_START +6;
private const int WM_CAP_SET_CALLBACK_ERROR=WM_CAP_START +2;
private const int WM_CAP_SET_CALLBACK_STATUSA= WM_CAP_START +3;
private const int WM_CAP_SET_CALLBACK_FRAME= WM_CAP_START +5;
private const int WM_CAP_SET_SCALE=WM_CAP_START+ 53;
private const int WM_CAP_SET_PREVIEWRATE=WM_CAP_START+ 52;
private IntPtr hWndC;
private bool bStat = false;
private IntPtr mControlPtr;
private int mWidth;
private int mHeight;
private int mLeft;
private int mTop;

///
/// 初始化摄像头
///
/// 控件的句柄
/// 开始显示的左边距
/// 开始显示的上边距
/// 要显示的宽度
/// 要显示的长度
public Pick(IntPtr handle, int left, int top, int width,int height)
{
mControlPtr = handle;
mWidth = width;
mHeight = height;
mLeft = left;
mTop = top;
}
[DllImport("avicap32.dll")]
private static extern IntPtr capCreateCaptureWindowA(byte[] lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID);
[DllImport("avicap32.dll")]
private static extern int capGetVideoFormat(IntPtr hWnd, IntPtr psVideoFormat, int wSize );
[DllImport("User32.dll")]
private static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, int lParam);
///
/// 开始显示图像
///
public void Start()
{
if (bStat)
return;
bStat = true;
byte[] lpszName = new byte[100];
hWndC = capCreateCaptureWindowA(lpszName,WS_CHILD|WS_VISIBLE ,mLeft,mTop,mWidth,mHeight,mControlPtr,0);
if (hWndC.ToInt32() != 0)
{
SendMessage(hWndC, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);
SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, 0, 0);
SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, 0, 0);
SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, 0, 0);
SendMessage(hWndC, WM_CAP_SET_SCALE, 1, 0);
SendMessage(hWndC, WM_CAP_SET_PREVIEWRATE, 66, 0);
SendMessage(hWndC, WM_CAP_SET_OVERLAY, 1, 0);
SendMessage(hWndC, WM_CAP_SET_PREVIEW, 1, 0);
}
return;
}
///
/// 停止显示
///
public void Stop()
{
SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);
bStat = false;
}
///
/// 抓图
///
/// 要保存bmp文件的路径
public void GrabImage(string path)
// public void GrabImage( )
{
IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
SendMessage(hWndC,WM_CAP_SAVEDIB,0,hBmp.ToInt32());
}

///
/// 录像
///
/// 要保存avi文件的路径
public void Kinescope(string path)
{
IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
SendMessage(hWndC,WM_CAP_FILE_SET_CAPTURE_FILEA,0,hBmp.ToInt32());
SendMessage(hWndC, WM_CAP_SEQUENCE, 0, 0);
}
///
/// 停止录像
///
public void StopKinescope()
{
SendMessage(hWndC, WM_CAP_STOP, 0, 0);
}
}
}